The Organisms That Produced the Oxygen Gas in Earth's Atmosphere

question 90

Multiple Choice

The organisms that produced the oxygen gas in Earth's atmosphere in ancient times were

• A) heterotrophic eukaryotes.
• B) autotrophic eukaryotes.
• C) autotrophic prokaryotes.
• D) heterotrophic prokaryotes.
• E) completely unlike modern organisms.

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